Ringsizely

Ring size 10.5 in millimetres

US ring size 10.5 is 20.17 mm inner diameter and 63.4 mm circumference.

20.17 mm inner Ø
Proportional only — actual on-screen size depends on your display.
US / CA
10.5
UK / AU
U½
EU / ISO
63
Japan
22
CH / IT / ES
23
Ø in
0.794
50 mm reference
Actual-size print check Inner diameter: 20.17 mm. Print at 100% and verify the 50 mm reference bar before comparing a ring.

This is around the average men’s ring size (US 9–10). See the full international ring size chart · Converter

Frequently asked questions

What is ring size 10.5 in mm?

US ring size 10.5 has an inner diameter of 20.17 mm and an inner circumference of 63.4 mm.

What is US 10.5 in UK, EU and Japan ring sizes?

US 10.5 converts to UK U½, EU/ISO 63, Japan 22, and Switzerland/Italy/Spain 23.

Is ring size 10.5 small or large?

This is around the average men’s ring size (US 9–10).